Transparent heat insulating member

Abstract

An object of the present invention is to provide a transparent heat insulating member which can maintain transparency in a high-humidity. The transparent heat insulating member according to the embodiment of the present invention is a transparent heat insulating member including a cellulose porous body, in which the cellulose porous body contains a cellulose nanofiber and a water-repellent component, and the cellulose porous body has a fiber diameter of 3 to 40 nm.

What is claimed is: 
     
         1 . A transparent heat insulating member comprising:
 a cellulose porous body,   wherein the cellulose porous body contains a cellulose nanofiber and a water-repellent component, and   the cellulose porous body has a fiber diameter of 3 to 40 nm.   
     
     
         2 . The transparent heat insulating member according to  claim 1 ,
 wherein the transparent heat insulating member has a maximum length of 1000 mm or greater.   
     
     
         3 . The transparent heat insulating member according to  claim 1 ,
 wherein the transparent heat insulating member has a contact angle of 90 degrees or greater with respect to water.   
     
     
         4 . The transparent heat insulating member according to  claim 1 ,
 wherein the water-repellent component is a compound containing a fluorinated alkyl group.   
     
     
         5 . The transparent heat insulating member according to  claim 4 ,
 wherein in the compound containing a fluorinated alkyl group, the fluorinated alkyl group has 4 to 12 carbon atoms.   
     
     
         6 . The transparent heat insulating member according to  claim 4 ,
 wherein the compound containing a fluorinated alkyl group is an alkoxysilane containing a fluorinated alkyl group or a condensate of the alkoxysilane.   
     
     
         7 . The transparent heat insulating member according to  claim 6 ,
 wherein the alkoxysilane is a compound represented by Formula (I),   
       
         
           
           
               
               
           
         
         in Formula (I), R a  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R a 's are present, R a 's may be the same as or different from each other, 
         R b  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R b 's are present, R b 's may be the same as or different from each other, 
         p represents an integer of 1 to 3, 
         q represents an integer of 0 to 10, 
         r represents an integer of 0 to 19, and 
         X represents a hydrogen atom or a fluorine atom. 
       
     
     
         8 . The transparent heat insulating member according to  claim 2 ,
 wherein the transparent heat insulating member has a contact angle of 90 degrees or greater with respect to water.   
     
     
         9 . The transparent heat insulating member according to  claim 2 ,
 wherein the water-repellent component is a compound containing a fluorinated alkyl group.   
     
     
         10 . The transparent heat insulating member according to  claim 9 ,
 wherein in the compound containing a fluorinated alkyl group, the fluorinated alkyl group has 4 to 12 carbon atoms.   
     
     
         11 . The transparent heat insulating member according to  claim 9 ,
 wherein the compound containing a fluorinated alkyl group is an alkoxysilane containing a fluorinated alkyl group or a condensate of the alkoxysilane.   
     
     
         12 . The transparent heat insulating member according to  claim 11 ,
 wherein the alkoxysilane is a compound represented by Formula (I),   
       
         
           
           
               
               
           
         
         in Formula (I), R a  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R a 's are present, R a 's may be the same as or different from each other, 
         R b  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R b 's are present, R b 's may be the same as or different from each other, 
         p represents an integer of 1 to 3, 
         q represents an integer of 0 to 10, 
         r represents an integer of 0 to 19, and 
         X represents a hydrogen atom or a fluorine atom. 
       
     
     
         13 . The transparent heat insulating member according to  claim 3 ,
 wherein the water-repellent component is a compound containing a fluorinated alkyl group.   
     
     
         14 . The transparent heat insulating member according to  claim 13 ,
 wherein in the compound containing a fluorinated alkyl group, the fluorinated alkyl group has 4 to 12 carbon atoms.   
     
     
         15 . The transparent heat insulating member according to  claim 13 ,
 wherein the compound containing a fluorinated alkyl group is an alkoxysilane containing a fluorinated alkyl group or a condensate of the alkoxysilane.   
     
     
         16 . The transparent heat insulating member according to  claim 13 ,
 wherein the alkoxysilane is a compound represented by Formula (I),   
       
         
           
           
               
               
           
         
         in Formula (I), R a  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R a 's are present, R a 's may be the same as or different from each other, 
         R b  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R b 's are present, R b 's may be the same as or different from each other, 
         p represents an integer of 1 to 3, 
         q represents an integer of 0 to 10, 
         r represents an integer of 0 to 19, and 
         X represents a hydrogen atom or a fluorine atom. 
       
     
     
         17 . The transparent heat insulating member according to  claim 8 ,
 wherein the water-repellent component is a compound containing a fluorinated alkyl group.   
     
     
         18 . The transparent heat insulating member according to  claim 17 ,
 wherein in the compound containing a fluorinated alkyl group, the fluorinated alkyl group has 4 to 12 carbon atoms.   
     
     
         19 . The transparent heat insulating member according to  claim 17 ,
 wherein the compound containing a fluorinated alkyl group is an alkoxysilane containing a fluorinated alkyl group or a condensate of the alkoxysilane.   
     
     
         20 . The transparent heat insulating member according to  claim 17 ,
 wherein the alkoxysilane is a compound represented by Formula (I),   
       
         
           
           
               
               
           
         
         in Formula (I), R a  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R a 's are present, R a 's may be the same as or different from each other, 
         R b  represents an alkyl group having 1 to 4 carbon atoms, in a case where a plurality of R b 's are present, R b 's may be the same as or different from each other, 
         p represents an integer of 1 to 3, 
         q represents an integer of 0 to 10, 
         r represents an integer of 0 to 19, and 
         X represents a hydrogen atom or a fluorine atom.